HD 43197

Last updated
HD 43197 / Amadioha
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Canis Major
Right ascension 06h 13m 35.66155s [1]
Declination −29° 53′ 50.1516″ [1]
Apparent magnitude  (V)8.98 [2]
Characteristics
Spectral type G8/K0 IV/V [3]
Apparent magnitude  (B)9.797 [2]
Apparent magnitude  (J)7.658±0.024 [2]
Apparent magnitude  (H)7.328±0.038 [2]
Apparent magnitude  (K)7.203±0.026 [2]
B−V color index 0.817±0.022 [2]
Astrometry
Radial velocity (Rv)72.45±0.13 [1]  km/s
Proper motion (μ)RA: 147.648±0.010  mas/yr [1]
Dec.: 16.600±0.011  mas/yr [1]
Parallax (π)16.0171 ± 0.0106  mas [1]
Distance 203.6 ± 0.1  ly
(62.43 ± 0.04  pc)
Absolute magnitude  (MV)5.24 [2]
Details
Mass 1.02±0.02 [4]   M☉
Radius 0.96±0.02 [4]   R☉
Luminosity 0.74±0.01 [4]   L☉
Surface gravity (log g)4.47±0.03 [4]   cgs
Temperature 5,469±35 [4]   K
Metallicity [Fe/H]0.4 [5]   dex
Rotational velocity (v sin i)2.18 [5]  km/s
Age 3.1±2.0 [4]   Gyr
Other designations
Amadioha, CD−29°2884, HD  43197, HIP  29550, SAO  171427, PPM  250048 [6]
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia 		data

HD 43197 is a star with an exoplanetary companion in the southern constellation of Canis Major. It has been given the proper name Amadioha, as selected by Nigeria during the NameExoWorlds campaign that celebrated the 100th anniversary of the IAU. Amadioha is the god of thunder in Igbo mythology. [7] [8] It has an apparent visual magnitude of 8.98, [2] meaning this is a ninth magnitude star that is too dim to be visible to the naked eye. The system is located at a distance of 204  light-years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +72 km/s. [1] It made its closest approach some 583,000 years ago when it came to within 87 light-years. [2]

Contents

The stellar classification of this star is G8/K0 IV/V, [3] which may be interpreted to mean the spectrum is intermediate between similar stars of class G8 and K0, and its luminosity class showing a blend of a main sequence star (V) and a subgiant star (IV). It is a weakly active star with a high metallicity, being five halves as much as the Sun. [5] The star is about the same mass and size as the Sun, although the luminosity is only 74% of solar. [4] The star's age is estimated to be at least three billion years [5] and it is modelled to be right at the end of its main sequence life. [1]

Planetary system

In 2009, the HARPS planet search program announced a Jovian planet in a highly eccentric orbit around the star. [5] The planet spends ~78% of its orbital period in the habitable zone of the host star, although temperatures can reach 716 K during periastron passage. [9] In 2022, a second super-Jovian planet was discovered using a combination of radial velocity and astrometry. Assuming the inner planet shares the outer planet's orbital inclination, its true mass would be about 4  MJ. [10]

The HD 43197 planetary system [10]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (Equiano) ≥0.553+0.052
−0.048  MJ 		0.882+0.035
−0.039		308.9+2.3
−2.8		0.742+0.017
−0.018		——
c7.868+1.760
−1.599  MJ 		8.540+2.334
−1.584		9296.0+4133.0
−2422.1		0.149+0.112
−0.087		11.420+5.388
−3.070 ° 		—

See also

Related Research Articles

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HD 137388 is an orange-hued star in the southern constellation of Apus. It has the proper name Karaka, after the native New Zealand karaka tree. The name was assigned by representatives of New Zealand in the IAU's NameExoWorlds contest. The star is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.70. It is located at a distance of 132 light years from the Sun based on parallax. The star is drifting further away with a radial velocity of +26 km/s, having come as close as 52.9 light-years some 1.2 million years ago. It has an absolute magnitude of 5.75.

HD 212771, also named Lionrock, is a solitary star in the southern zodiac constellation Aquarius. It has an apparent magnitude of 7.60, making it readily visible with binoculars but not the naked eye. Parallax measurements place the object at a distance of 364 light years, and is currently receding with a radial velocity of 15 km/s.

References

  1. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 4 5 6 7 8 9 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID   119257644.
  3. 1 2 Houk, Nancy (1982). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
  4. 1 2 3 4 5 6 7 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv: 1411.4302 . Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID   54555839.
  5. 1 2 3 4 5 Naef, Dominique; et al. (2010). "The HARPS Search for Southern Extrasolar Planets XXIII. 8 Planetary Companions to Low-activity Solar-type Stars". Astronomy and Astrophysics. 523: A15. arXiv: 1008.4600 . Bibcode:2010A&A...523A..15N. doi:10.1051/0004-6361/200913616. S2CID   118845989.
  6. ↑ "HD 43197". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-10-20.
  7. ↑ "Approved names". NameExoworlds. IAU. Retrieved 2020-01-02.
  8. ↑ "International Astronomical Union | IAU". www.iau.org. IAU. Retrieved 2020-01-02.
  9. ↑ Kane, Stephen R.; Gelino, Dawn M. (November 2011). "Detectability of Exoplanet Periastron Passage in the Infrared". The Astrophysical Journal. 741 (1): 9. arXiv: 1108.1803 . Bibcode:2011ApJ...741...52K. doi:10.1088/0004-637X/741/1/52. S2CID   42643810. 52.
  10. 1 2 Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series . 262 (21): 21. arXiv: 2208.12720 . Bibcode:2022ApJS..262...21F. doi: 10.3847/1538-4365/ac7e57 . S2CID   251864022.
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